Re: [HACKERS] sorting big tables :(

From: Tom <tom(at)sdf(dot)com>
To: The Hermit Hacker <scrappy(at)hub(dot)org>
Cc: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>, mimo(at)interdata(dot)com(dot)pl, hackers(at)postgresql(dot)org
Subject: Re: [HACKERS] sorting big tables :(
Date: 1998-05-20 16:42:13
Message-ID: Pine.BSF.3.95q.980520094022.12309C-100000@misery.sdf.com
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On Wed, 20 May 1998, The Hermit Hacker wrote:

> One of the things that the Unix FS does is auto-defragmenting, at
> least the UFS one does. Whenever the system is idle (from my
> understanding), the kernel uses that time to clean up the file systems, to
> reduce the file system fragmentation.

No, that doesn't happen. The only way to eliminate fragmentation is a
dump/newfs/restore cycle. UFS does do fragmentation avoidance (which is
reason UFS filesystems have a 10% reserve).

Tom

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